So my testing ended on what I was talking about. Essentially I noticed that our sms would stop inboxing from our modems but if you pulled out the sim attached it to an android that had an account signed in it would popup a screen with a green check mark adding it to the account. We could put it back in the box and it would allow for sending again to android and make it to the inbox rather than the spam folder.
In regards to the limits. It depends on the data, the offer, etc. So without that and testing no way to say. Some offers id send could kill numbers instantly others would work for months